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The slope of the V-I curve is 4.9°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

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The slope of the V-I curve is 4.9°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

(a) .03 Ω

(b) .08 Ω

(c) .04 Ω

(d) .07 Ω

I have been asked this question during an internship interview.

The doubt is from Speed Control of Series Motor in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right choice is (b) .08 Ω

Best explanation: The slope of the V-I curve is resistance. The slope given is 4.9° so R=tan(4.9°)=.08 Ω. The slope of the I-V curve is reciprocal of resistance.

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